Blackjack Oak
Quercus marilandica

Family: Fagaceae (fag-AY-see-ee) (Info)
Genus: Quercus (KWER-kus) (Info)
Species: marilandica (mar-i-LAND-ih-ka) (Info)

Category:

Trees

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us

Height:

20-30 ft. (6-9 m)

30-40 ft. (9-12 m)

over 40 ft. (12 m)

Spacing:

30-40 ft. (9-12 m)

over 40 ft. (12 m)

Hardiness:

USDA Zone 3a: to -39.9 C (-40 F)

USDA Zone 3b: to -37.2 C (-35 F)

USDA Zone 4a: to -34.4 C (-30 F)

USDA Zone 4b: to -31.6 C (-25 F)

USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:

Full Sun

Danger:

Parts of plant are poisonous if ingested

Bloom Color:

Brown/Bronze

Inconspicuous/none

Bloom Time:

Mid Spring

Foliage:

Grown for foliage

Deciduous

Other details:

Unknown - Tell us

Soil pH requirements:

4.6 to 5.0 (highly acidic)

5.1 to 5.5 (strongly acidic)

Patent Information:

Non-patented

Propagation Methods:

From seed; direct sow outdoors in fall

Seed Collecting:

Properly cleaned, seed can be successfully stored

Regional

This plant has been said to grow in the following regions:

Atmore, Alabama

Pelham, Alabama

Morrilton, Arkansas

Keystone Heights, Florida

Benton, Kentucky

Georgetown, Kentucky

Louisville, Kentucky

Weeksbury, Kentucky

Pasadena, Maryland

Perkinston, Mississippi

Rogersville, Missouri

Egg Harbor City, New Jersey

Lawnside, New Jersey

Neptune, New Jersey

Matthews, North Carolina

West End, North Carolina

Pauls Valley, Oklahoma

Tecumseh, Oklahoma

Christiana, Tennessee

Boerne, Texas

Troup, Texas

show all

Gardeners' Notes:

2
positives
3
neutrals
0
negatives
RatingContent
Neutral

On Apr 28, 2010, JefferyDollars from Lawnside, NJ wrote:

I highly doubt blackjack oak is hardy to zone 3, its pretty much a zone 6 oak.

Neutral

On Nov 27, 2006, QueenB from Shepherd, TX (Zone 8b) wrote:

Often found here in East Texas growing with Southern Red Oaks and Post Oaks. The leaves do resemble Water Oaks to a degree, but are larger and wider, and the bark is nearly black on mature trees. It's not unusual to find some really big leaves up to 8" long on saplings. Acorns are medium sized, barrel shaped, with striping.

Positive

On Jul 17, 2005, escambiaguy from Atmore, AL (Zone 8b) wrote:

This tree is usually a small understory tree where I live. The leaves resemble water oak but are wider. The two are often confused. Blackjack oak is quite tolerant of shade and grows slowly. It seems to sporadically occur and never forms pure stands.

Neutral

On Dec 24, 2004, TREEHUGR from Now in Orlando, FL (Zone 9b) wrote:

Those are some great photos, Melody and Jeff.

The blackjack oak is another broad leafed deciduous oak that is native to Florida. It's found growing in with pines and other oaks in dry uplands and ridges. Also native to much of the east coast and Texas.

Spreading growth shape to 20-50 feet.

Positive

On Jun 15, 2004, melody from Benton, KY (Zone 7a) wrote:

One of the wonderful Red Oaks, the Blackjack is denoted by the large fan like leaves. The pointed tufts show that it is in the Red Oak family.

Mature trees can get quite large and provide deep shade for outdoor recreation. They also provide acorns for the 'mast' in the Fall that birds, deer and small animals need to survive through the winter.

Here in West KY, we are blessed by a great many oak species, and a great number of them are in mixed forests. This Blackjack is in the City Park and it is surrounded by Southern Red Oaks, Post Oaks ,Eastern Black Oaks and Shingle Oaks. All of these are 'wild' trees that were there before the park was built.